package com.eshore.nrms.util;

import com.google.common.collect.Maps;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Map;
import java.util.Random;

/**
 * Created by xh on 2015/7/7.
 */
public class RandomValidateCodeGenerator {


    private static final Random random = new Random(System.currentTimeMillis());
    private static final String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生的字符串

    private int width = 80;//图片宽
    private int height = 30;//图片高
    private int lineSize = 40;//干扰线数量
    private int stringNum = 4;//随机产生字符数量
    /*
     * 获得字体
     */
    private Font getFont(){
        return new Font("Fixedsys",Font.CENTER_BASELINE,18);
    }
    /*
     * 获得颜色
     */
    private Color getRandColor(int fc,int bc){
        if(fc > 255)
            fc = 255;
        if(bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc-fc-16);
        int g = fc + random.nextInt(bc-fc-14);
        int b = fc + random.nextInt(bc-fc-18);
        return new Color(r,g,b);
    }

    public Map.Entry<String, BufferedImage> getRandCode() {
        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();//产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
        g.setColor(getRandColor(110, 133));
        //绘制干扰线
        for(int i=0;i<=lineSize;i++){
            drowLine(g);
        }
        //绘制随机字符
        String randomString = "";
        for(int i=1;i<=stringNum;i++){
            randomString=drowString(g,randomString,i);
        }
        g.dispose();

        return Maps.immutableEntry(randomString, image);
    }

    public Map.Entry<String, BufferedImage> getRandCode(String code) {
        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();//产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
        g.fillRect(0, 0, width, height);
       
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
        g.setColor(getRandColor(110, 133));
        
        //绘制干扰线
        for(int i=0;i<=lineSize;i++){
            drowLine(g);
        }
        //绘制随机字符
        for(int i=1;i<=stringNum;i++){
            drowStringByKey(g,code.charAt(i-1)+"",i);
        }
        g.dispose();

        return Maps.immutableEntry(code, image);
    }
    
    /*
     * 绘制字符串
     */
    private String drowString(Graphics g,String randomString,int i){
        g.setFont(getFont());
        g.setColor(new Color(random.nextInt(101),random.nextInt(111),random.nextInt(121)));
        String rand = String.valueOf(getRandomString(random.nextInt(randString.length())));
        randomString +=rand;
        g.translate(random.nextInt(3), random.nextInt(3));
        g.drawString(rand, 13*i, 16);
        return randomString;
    }
    
    public static String randKey(int len){
    	StringBuffer buffer = new StringBuffer();
    	for(int i=0 ; i<4 ; i++){
    		buffer.append(randString.charAt(random.nextInt(randString.length())));
    	}
    	return buffer.toString();
    }
    
    private String drowStringByKey(Graphics g,String randomString,int i){
        g.setFont(getFont());
        g.setColor(new Color(random.nextInt(101),random.nextInt(111),random.nextInt(121)));
        g.translate(random.nextInt(3), random.nextInt(3));
        g.drawString(randomString, 13*i, 16);
        return randomString;
    }
    /*
     * 绘制干扰线
     */
    private void drowLine(Graphics g){
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(13);
        int yl = random.nextInt(15);
        g.drawLine(x, y, x+xl, y+yl);
    }
    /*
     * 获取随机的字符
     */
    public String getRandomString(int num){
        return String.valueOf(randString.charAt(num));
    }
}
